How bad is a 900 on the SAT?

I'm curious, how should one interpret a score of 900 on the SAT? Is this considered a poor performance, average, or somewhere in between? Given that the SAT is a standardized test used for college admissions, how likely is it that a student scoring 900 would be able to gain admittance to a competitive university? Additionally, what strategies might a student employ to improve their score if they find themselves in this position? Would additional tutoring, test prep courses, or simply more focused studying be advisable? Clarifying these points would greatly assist students seeking to understand the significance of this particular score on the SAT.